💿🐜 Antkeeper source code
https://antkeeper.com
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90 lines
2.6 KiB
90 lines
2.6 KiB
/*
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* Copyright (C) 2020 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "pheromone-matrix.hpp"
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#include <vmq/vmq.hpp>
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void convolve(pheromone_matrix* matrix, const float* kernel, int kernel_size)
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{
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float* front = matrix->buffers[matrix->current];
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float* back = matrix->buffers[(matrix->current + 1) % 2];
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const int kernel_radius = kernel_size << 1;
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// For each pheromone matrix row
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for (int i = 0; i < matrix->rows; ++i)
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{
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// For each pheromone in the row
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for (int j = 0; j < matrix->columns; ++j)
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{
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// Reset accumulator
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float accumulator = 0.0f;
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// For each kernel row
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for (int k = -kernel_radius; k <= kernel_radius; ++k)
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{
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// For each kernel element
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for (int l = -kernel_radius; l <= kernel_radius; ++l)
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{
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// Determine row and column of pheromone corresponding to the kernel element.
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int m = i + k;
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int n = j + l;
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// If the row and column indices are within the matrix
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if (m >= 0 && m < matrix->rows && n >= 0 && n < matrix->columns)
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{
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// Multiply pheromone strength in the front buffer by the kernel value and add it to the accumulator.
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accumulator += front[m * matrix->columns + n] * kernel[(k + kernel_radius) * kernel_size + l + kernel_radius];
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}
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}
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}
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// Set pheromone strength in the back buffer equal to the accumulator value
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back[i * matrix->columns + j] = accumulator;
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}
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}
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// Swap buffers
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matrix->current = (matrix->current + 1) % 2;
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}
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void evaporate(pheromone_matrix* matrix, float factor)
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{
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const int size = matrix->columns * matrix->rows;
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for (int i = 0; i < size; ++i)
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{
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matrix->buffers[matrix->current][i] *= factor;
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}
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}
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void diffuse(pheromone_matrix* matrix)
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{
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const vmq::matrix<float, 3, 3> diffusion_kernel =
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vmq::mul(
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vmq::matrix<float, 3, 3>
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{{
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{1, 2, 1},
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{2, 4, 2},
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{1, 2, 1}
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}},
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1.0f / 16.0f);
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convolve(matrix, &diffusion_kernel[0][0], 3);
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}
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